A 2.5GHz delay-based wideband OFDM outphasing modulator in 45nm-LP CMOS

@article{Ravi2011A2D,
  title={A 2.5GHz delay-based wideband OFDM outphasing modulator in 45nm-LP CMOS},
  author={Ashoke Ravi and Paolo Madoglio and Marian Verhelst and Masoud Sajadieh and Mariano A. Aguirre and Hongtao Xu and Stefano Pellerano and Ismael Lomeli and Jorge Bueno Z{\'a}rate and Luis Carlos Barbosa Cuellar and Ofir Degani and Hasnain Lakdawala and Krishnamurthy Soumyanath and Yorgos Palaskas},
  journal={2011 Symposium on VLSI Circuits - Digest of Technical Papers},
  year={2011},
  pages={26-27}
}
A 2.5 GHz delay-based CMOS outphasing transmitter for wideband OFDM is presented in 45nm LP CMOS. It dynamically delays LO edges to modulate the phase of two outphasing signals. A Tapped-Delay-Line coarse delay modulator allows delay modulation at the LO rate with no glitches. This is used to implement a 11-bit ΣΔ-dithered θ modulator with phase-domain filtering, and a 9-bit open-loop ϕ modulator. The system meets EVM and ACPR requirements for 802.11g at 2.5GHz. 

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